WordPress and WordPress MU before 2.8.1 allow remote attackers to obtain sensitive information via a direct request to wp-settings.php, which reveals the installation path in an error message.
https://exchange.xforce.ibmcloud.com/vulnerabilities/51734
http://www.vupen.com/english/advisories/2009/1833
http://www.securityfocus.com/archive/1/504795/100/0/threaded